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Realm
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What is Realm?
• Fast, zero-copy, embedded database
• Tens of thousands of devs, 100M+ devices
• Object & model-oriented
• Full ACID transactions
• Well defined threading model
• Cross-platform C++ core with language bindings
(currently Objective-C, Swift & Android)
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Open Source*
github.com/realm/realm-cocoa
* Bindings 100% open source, C++ core launching as
Apache 2
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Why?
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Current State of iOS
Persistence
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Core Data
• Full-featured & mature
• 10+ years old ORM for SQLite
• Slow
• Complex and difficult to learn/debug
• only
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SQLite
• Faster than Core Data
• Optimized for iOS
• Cross Platform
• 14+ years old
• Bad user experience
• Manual mapping and queries
• Lack of thread safety
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Other Options
• FMDB
• YapDatabase
• CouchbaseLite
• LevelDB
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Lots has changed in last decade
• Smartphone Revolution
• Low Connectivity
• NoSQL
• Need for Sync
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Benchmarks
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Realm Models
@interface Employee : RLMObject
@property NSString *name;
@property NSDate *startDate;
@property float salary;
@property BOOL fullTime;
@end
RLM_ARRAY_TYPE(Employee)
@interface Company : RLMObject
@property NSString *name;
@property Employee *ceo;
@property RLMArray *employees;
@end
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Realm Models (Swift)
class Employee: Object {
dynamic var name = "" // you can specify defaults
dynamic var startDate = NSDate()
dynamic var salary = 0.0
dynamic var fullTime = true
}
class Company: Object {
dynamic var name = ""
dynamic var ceo: Employee? // optional. who needs CEO's?!
let employees = List()
}
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Using Realm
let company = Company() // Using Realm Objects
company.name = "Realm" // etc...
let realm = Realm()
realm.write { // Transactions
realm.add(company)
}
// Queries
let companies = realm.objects(Company)
companies[0].name // => Realm (generics)
// "Jack"s who work full time (lazily loaded & chainable)
let ftJacks = realm.objects(Employee).filter("name = 'Jack'")
.filter("fullTime = true")
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Background Operations
dispatch_async(queue) {
let realm = Realm()
realm.beginWriteTransaction()
Person.createInDefaultRealmWithObject(
["name": "randomstring", "birthdate": NSDate()]
)
// make this data available to other threads
realm.commitWriteTransaction()
}
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Notifications
let token = realm.addNotificationBlock { note, realm in
viewController.updateUI()
}
// Later...
realm.removeNotification(token)
Fine-grain Notifications Coming Soon!
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Current Limitations
• NSDate is truncated to the second
(use NSTimeInterval instead)
• KVO is not supported
(we'll add support along with fine-grain notifications)
• Realm Object Setters & Getters cannot be overriden
(use ignored properties as proxies instead)
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Work In Progress
• Multiprocess
• Fine-grain notifications
• Async queries
• Cascading deletes
• Nullable types
• Sync
• Open source Core
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Where is Realm used?
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Thermodo
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Groupon
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Coinbase
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Buzzfeed
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Dubsmash
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Quickbooks
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ZipRecruiter
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Macaroni
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Aplos
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What Can You Build
With Realm?
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Where to find us
• Facebook: j.mp/realmjp
• Twitter: twitter.com/realm
• GitHub: github.com/realm
• StackOverflow: stackoverflow.com/questions/tagged/realm
• Email: [email protected]